/**
 * Copyright (C) 2013 DaiKit.com - daikit4gxt module (admin@daikit.com)
 *
 *         Project home : http://code.daikit.com/daikit4gxt
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.daikit.daikit4gxt.client.ui.editor.field.validator;

import java.util.ArrayList;
import java.util.List;

import com.google.gwt.editor.client.Editor;
import com.google.gwt.editor.client.EditorError;
import com.sencha.gxt.widget.core.client.form.Validator;
import com.sencha.gxt.widget.core.client.form.validator.EmptyValidator;


/**
 * Empty validator adding conditional behaviour
 * 
 * @author tcaselli
 * @version $Revision$ Last modifier: $Author$ Last commit: $Date$
 * @param <T>
 */
public abstract class DkEmptyConditionalValidator<T> implements Validator<T>
{

	private final EmptyValidator<T> emptyValidator = new EmptyValidator<T>();

	@Override
	public List<EditorError> validate(final Editor<T> editor, final T value)
	{
		List<EditorError> allErrors = null;
		if (condition())
		{
			allErrors = emptyValidator.validate(editor, value);
		}
		if (allErrors == null)
		{
			allErrors = new ArrayList<EditorError>();
		}
		return allErrors;
	}

	protected abstract boolean condition();
}
